What things should pay attention to when making the core assembly and maintenance?

As an important part of transformer, it has many key points to be attention.

Content

l Core stack of key points

In the stacking link of the iron core, the large core can be stacked on the rolling table to stand up, and the small core is stacked on the platform. First of all, the support or bracket device corresponding to the core column and the yoke axis should be placed on the platform. For the core column to be tied, part of the temporary fixture should be placed, and then the upper and lower yoke clips, insulation pads, protective plates, and then stacked. Using the positioning device, such as the inner four corner positioning method, the positioning device is divided into the upper and lower parts, and the middle is connected by the column and teeth. The vertical adjustable positioning block is positioned to the inner Angle of the laminated plate and adjusts the level of each stack. The core stack is usually two or small three stacks because of the number of pieces Too much will increase the no-load loss and current and friction.

To ensure that the deviation between the size and the geometric shape of the core is within the allowable range, control the axis deviation of the center column, the juke local protrusion, joint size, etc., there is no lap between the lamination, pay attention to the levelness of the stacking foundation, adjust the seam20mm thick, to prevent the clamping and the lamination to lead to multi-point grounding. After stacking inspection and correction, place the guard plate, insulation plate and clamp, clamp the iron yoke with the binding steel strip, clamp the iron column with the temporary fixture, install the cushion and wrap the glass strap, control the binding thickness, and cool to60℃ to remove the temporary fixture. In order to reduce working hours, the iron yoke may not be folded.

l Oil channel or airway setting critical

The heart oil channel or airway setting is also important. Due to the loss of the core operation, the airway of the dry transformer should be wide enough (generally over 20mm) and brass is commonly used to reduce additional losses. The oil-immersed transformer is commonly used insulated oil channel, and the two sides should be connected with grounding pads, and the oil channel should have a certain direction to facilitate heat transfer.

l Core inspection specification

Core inspection, specific products such as new products, export products, high voltage grade or high capacity products of the core finished products to do no-load performance test, electrical steel sheet material needs to be tested. There are many standards for the technical inspection of the finished iron core of large transformers, such as binding and tightening, reliable grounding, good epoxy adhesive tape, the inclination of the core column meeting the requirements, the thickness and diameter deviation, the pressure resistance between the clamp and the core, etc.

l Glass adhesive tape binding iron core repair key points

For the maintenance of the glass adhesive belt binding core, when the diameter of the core column is large or the winding needs to be removed, the ground is flat and the core is vertical. When removing the iron yoke piece, prevent the deformation and tilt of the core. clamp the upper end of the core column in advance. After disassembly, tie the core column piece with the tape to prevent the fracture of the first hoop glass adhesive belt and the core piece.

In Summary

In a word, the assembly and maintenance of the core are related to the performance and safety of transformers. From the fine operation of the stack to the reasonable planning of the oil channel setting, from the strict inspection standards to the careful maintenance, every link needs to strictly follow the professional norms and requirements, to ensure that the core plays a stable and reliable role in the operation of the transformer, to ensure the normal operation of the whole power system.

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LuShan, est.1975, is a Chinese professional manufacturer specializing in power transformers and reactors for 49 years. Leading products are single-phase transformer, three-phase isolation transformers,electrical transformer,distribution transformer, step down and step up transformer, low voltage transformer, high voltage transformer, control transformer, toroidal transformer, R-core transformer;DC inductors, AC reactors, filtering reactor, line and load reactor, chokes, filtering reactor, and intermediate,high-frequency products.

Our power transformers and reactors are widely used in 10 application areas: rapid transit, construction machinery, renewable energy, intelligent manufacturing, medical equipment, coal mine explosion prevention , excitation system, vacuum sintering(furnace), central air conditioning.

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